Which statement about Dynamic ARP Inspection is true ?

Which statement about Dynamic ARP Inspection is true ?
A . In a typical network, you make all ports as trusted expect for the ports connection to switches , which areuntrusted
B . DAI associates a trust state with each switch
C . DAI determines the validity of an ARP packet based on valid IP to MAC address binding from the DHCPsnooping database
D . DAI intercepts all ARP requests and responses on trusted ports only
E . DAI cannot drop invalid ARP packets

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Answer: C